package ael.imarkket.util;

import android.annotation.TargetApi;
import android.app.Activity;
import android.os.Build;
import android.view.View;
import android.view.WindowManager;

/**
 * An API 11+ implementation of {@link SystemUiHider}. Uses APIs available in Honeycomb and later (specifically {@link View#setSystemUiVisibility(int)}) to show and hide the system
 * UI.
 */
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public class SystemUiHiderHoneycomb extends SystemUiHiderBase {
	/**
	 * Flags for {@link View#setSystemUiVisibility(int)} to use when showing the system UI.
	 */
	private int		mShowFlags;

	/**
	 * Flags for {@link View#setSystemUiVisibility(int)} to use when hiding the system UI.
	 */
	private int		mHideFlags;

	/**
	 * Flags to test against the first parameter in {@link android.view.View.OnSystemUiVisibilityChangeListener#onSystemUiVisibilityChange(int)} to determine the system UI
	 * visibility state.
	 */
	private int		mTestFlags;

	/**
	 * Whether or not the system UI is currently visible. This is cached from {@link android.view.View.OnSystemUiVisibilityChangeListener}.
	 */
	private boolean	mVisible	= true;

	/**
	 * Constructor not intended to be called by clients. Use {@link SystemUiHider#getInstance} to obtain an instance.
	 */
	protected SystemUiHiderHoneycomb(Activity activity, View anchorView, int flags) {
		super(activity, anchorView, flags);

		mShowFlags = View.SYSTEM_UI_FLAG_VISIBLE;
		mHideFlags = View.SYSTEM_UI_FLAG_LOW_PROFILE;
		mTestFlags = View.SYSTEM_UI_FLAG_LOW_PROFILE;

		if ((mFlags & FLAG_FULLSCREEN) != 0) {
			// If the client requested fullscreen, add flags relevant to hiding
			// the status bar. Note that some of these constants are new as of
			// API 16 (Jelly Bean). It is safe to use them, as they are inlined
			// at compile-time and do nothing on pre-Jelly Bean devices.
			mShowFlags |= View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN;
			mHideFlags |= View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN | View.SYSTEM_UI_FLAG_FULLSCREEN;
		}

		if ((mFlags & FLAG_HIDE_NAVIGATION) != 0) {
			// If the client requested hiding navigation, add relevant flags.
			mShowFlags |= View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION;
			mHideFlags |= View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
			mTestFlags |= View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
		}
	}

	/** {@inheritDoc} */
	@Override
	public void setup() {
		mAnchorView.setOnSystemUiVisibilityChangeListener(mSystemUiVisibilityChangeListener);
	}

	/** {@inheritDoc} */
	@Override
	public void hide() {
		mAnchorView.setSystemUiVisibility(mHideFlags);
	}

	/** {@inheritDoc} */
	@Override
	public void show() {
		mAnchorView.setSystemUiVisibility(mShowFlags);
	}

	/** {@inheritDoc} */
	@Override
	public boolean isVisible() {
		return mVisible;
	}

	private View.OnSystemUiVisibilityChangeListener	mSystemUiVisibilityChangeListener	= new View.OnSystemUiVisibilityChangeListener() {
																							@Override
																							public void onSystemUiVisibilityChange(int vis) {
																								// Test against mTestFlags to see if the system UI is visible.
																								if ((vis & mTestFlags) != 0) {
																									if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) {
																										// Pre-Jelly Bean, we must manually hide the action bar
																										// and use the old window flags API.
																										mActivity.getActionBar().hide();
																										mActivity.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
																												WindowManager.LayoutParams.FLAG_FULLSCREEN);
																									}

																									// Trigger the registered listener and cache the visibility
																									// state.
																									mOnVisibilityChangeListener.onVisibilityChange(false);
																									mVisible = false;

																								} else {
																									mAnchorView.setSystemUiVisibility(mShowFlags);
																									if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) {
																										// Pre-Jelly Bean, we must manually show the action bar
																										// and use the old window flags API.
																										mActivity.getActionBar().show();
																										mActivity.getWindow().setFlags(0,
																												WindowManager.LayoutParams.FLAG_FULLSCREEN);
																									}

																									// Trigger the registered listener and cache the visibility
																									// state.
																									mOnVisibilityChangeListener.onVisibilityChange(true);
																									mVisible = true;
																								}
																							}
																						};
}
